// WindowsProject1.cpp : Defines the entry point for the application.
//

#include "WindowsProject1.h"

#include "framework.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                      // current instance
WCHAR szTitle[MAX_LOADSTRING];        // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];  // the main window class name

// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                      _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine,
                      _In_ int nCmdShow) {
  UNREFERENCED_PARAMETER(hPrevInstance);
  UNREFERENCED_PARAMETER(lpCmdLine);

  // TODO: Place code here.

  // Initialize global strings
  LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
  LoadStringW(hInstance, IDC_WINDOWSPROJECT1, szWindowClass, MAX_LOADSTRING);
  MyRegisterClass(hInstance);

  // Perform application initialization:
  if (!InitInstance(hInstance, nCmdShow)) {
    return FALSE;
  }

  HACCEL hAccelTable =
      LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINDOWSPROJECT1));

  MSG msg;

  // Main message loop:
  while (GetMessage(&msg, nullptr, 0, 0)) {
    if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }
  }

  return (int)msg.wParam;
}

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance) {
  WNDCLASSEXW wcex;

  wcex.cbSize = sizeof(WNDCLASSEX);

  wcex.style = CS_HREDRAW | CS_VREDRAW;
  wcex.lpfnWndProc = WndProc;
  wcex.cbClsExtra = 0;
  wcex.cbWndExtra = 0;
  wcex.hInstance = hInstance;
  wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINDOWSPROJECT1));
  wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
  wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
  wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_WINDOWSPROJECT1);
  wcex.lpszClassName = szWindowClass;
  wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

  return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) {
  hInst = hInstance;  // Store instance handle in our global variable

  HWND hWnd =
      CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
                    0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

  if (!hWnd) {
    return FALSE;
  }

  ShowWindow(hWnd, nCmdShow);
  UpdateWindow(hWnd);

  return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE: Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam,
                         LPARAM lParam) {
  switch (message) {
    case WM_COMMAND: {
      int wmId = LOWORD(wParam);
      // Parse the menu selections:
      switch (wmId) {
        case IDM_ABOUT:
          DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
          break;
        case IDM_EXIT:
          DestroyWindow(hWnd);
          break;
        default:
          return DefWindowProc(hWnd, message, wParam, lParam);
      }
    } break;
    case WM_PAINT: {
      PAINTSTRUCT ps;
      HDC hdc = BeginPaint(hWnd, &ps);
      // TODO: Add any drawing code that uses hdc here...
      EndPaint(hWnd, &ps);
    } break;
    case WM_DESTROY:
      PostQuitMessage(0);
      break;
    default:
      return DefWindowProc(hWnd, message, wParam, lParam);
  }
  return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) {
  UNREFERENCED_PARAMETER(lParam);
  switch (message) {
    case WM_INITDIALOG:
      return (INT_PTR)TRUE;

    case WM_COMMAND:
      if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) {
        EndDialog(hDlg, LOWORD(wParam));
        return (INT_PTR)TRUE;
      }
      break;
  }
  return (INT_PTR)FALSE;
}
